4{41 -Deoxy-4{41 -oxoerythromycin B derivatives

ABSTRACT

Covers a 4&#39;&#39;&#39;&#39;-deoxy-4&#39;&#39;&#39;&#39;-oxoerythromycin compounds and derivatives thereof which are useful as antibiotics having a formula selected from the group consisting of:   WHERE R is -CH2SR3, R2 is hydrogen or loweralkyl, R3 is loweralkyl, and R1 is hydrogen or loweralkanoyl;   WHERE R1 and R2 are as before defined;   WHERE R is hydrogen or CH3CO;   where R1 is hydrogen or RCO, R is loweralkyl, R2 is hydrogen, CH3CO or RCO where R is loweralkyl; and   WHERE R3 is hydrogen or RCO where R is loweralkyl.

United States Patent [191 Jones et al.

[451 May 20, 1975 4 '-DEOXY-4 '-OXOERYTHROMYCIN B DERIVATIVES [75] Inventors: Peter Hadley Jones, Lake Forest;

Jerry Roy Martin, Waukegan; James Bruce McAlpine, Libertyville; Jeanne Marie Pauvlik, Chicago; John Soloman Tadanier, Waukegan,

all of I11.

[73] Assignee: Abbott Laboratories, North Chicago, Ill.

[22] Filed: Sept. 9, 1974 211 App]. No.: 504,417

Related U.S. Application Data [63] Continuation-impart of Ser. No. 372,387, June 21,

i973, Pat. No. 3,842,069.

[52] US. Cl. 260/210 E; 424/180 [51] Int. Cl. C07c 129/18 [58] Field of Search 260/210 E [56] References Cited UNITED STATES PATENTS 3,417,077 12/1968 Murphy et al 260/210 E 3,842,069 10/1974 Jones et al. 260/210 E Primary ExaminerJohnnie R. Brown Assistant Examiner-Cary B. Owens Attorney, Agent, or FirmR0bert L. Niblack; Vincent A. Mallare [57] ABSTRACT Covers a 4"-deoxy-4"-oxoerythromycin compounds and derivatives thereof which are useful as antibiotics having a formula selected from the group consisting of:

Formula I CH 3 O CH 3 where R is CH SR R is hydrogen or loweralkyl, R is loweralkyl, and R is hydrogen or loweralkanoyl;

Formula II where R and R are as before defined;

Formula III CH3 H a CH3 i 3 R0 CH3 CH3 Y HO I (& HO HO o' CH3 1 CH3) CH3 (/D\\/CH3 CH3 0 0 CH ocn where R is hydrogen or CH CO;

Formula 1V where R is hydrogen or RCO, R is loweralkyl, R is hydrogen, CH CO or RCO where R is loweralkyl; and.

where R is hydrogen or RCO where R is loweralkyl.

8 Claims, No Drawings 4 "-DEOXY-4"-OXOERYTHROMYCIN B DERIVATIVES CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation-in-part of U.S. application, Ser. No. 372,387 filed June 21, 1973 now U.S. Pat. No. 3,842,069.

DESCRIPTION OF THE INVENTION This invention relates to 4"-deoxy-4"-oxoerythromycin B derivatives which are useful as antibiotics or as intermediates in preparing other useful antibiotic compounds.

Erythromycin is produced in two forms denoted A and B by cultivating a strain of Streptomyces erythreus in a suitable nutrient medium as is taught in U.S. Pat. No. 2,653,899, Bunch, et al. The-structure of erythromycin is represented by the following formula:

(erythronolide) In this formula, when R R and R represent hydrogen and R represents hydroxyl, the structure illustrated is erythromycin A. When R, is, however, also hydrogen, the structure of erythromycin B is illustrated;

Erythromycin, as will be noted from the formula, comprises three cylic fragments. These fragments are referred to respectively as cladinose, desosamine and erythronolide. The positions on the cladinose ring are indicated by double primed numbers; the positions on the desosamine ring by single primed numbers; while positions on the erythronolide ring are indicated by unprimed numbers.

In order to prepare the erythromycin derivatives here one may start with either erythromycin B or 2' alkanoyl erythromycin 8. One of these derivatives is then treated with a dialkylsulfoxide in the presence of an acid anhydride to produce the 2-alkanoyl-4"-l l-O-adialkylsulfide-4"-deoxy-4-oxoerythromycin B. This compound in turn is reacted with a loweralkyl alcohol to produce the 4"-deoxy-1 1-O-a-dialkylsulfide-4"- oxoerythromycin B. The cyclic acetal derivative in turn is produced from the last-named compound by treating it with a combination of mercuric chloride and mercuric oxide. Lastly, the 4"-deoxy-4"-oxoerythromycin B is prepared from the cyclic acetal by treating the cyclic acetal with dilute hydrochloric acid. Alternatively, the 4"-deoxy-4"-oxoerythromycin B is prepared from the 4"-deoxy-l l-O-a-dialkylsulfide-4"-oxoerythromycin B by treatment of this compound with chloramine T in aqueous methanol.

- The following examples illustrate fully the preparation of the derivatives of the invention:

EXAMPLE 1 2'-Acetyl-4-deox'y-1 l-methylthiomethyl-4"-oxoerythromycin B CHJSCHZO EXAMPLE 2 4"-Deoxy-l 1-methythiomethyl-4"-oxoerythromycin B cH,scH o 2 -Acetyl-4 -deoxy- 1 1-methylthiomethyl-4 oxerythromycin B from Example 1 was dissolved in ml. of methanol. To this solution was added 50 ml. of 5% sodium bicarbonate, and the mixture was stirred for 24 hours. Some methanol was removed on the rotary evaporator, water was added to the mixture, and the mixture was extracted three times with chloroform. The combined chloroform extracts were washed with water, dried over sodium sulfate, and solvent was removed to give 2.32 g. of crude product, shown by NMR and TLC to be desired product.

Analysis to as follows:

Analysis calculated for: C I-I NO S, M.W. X 776.049; M.P. 167 173C.

Microanalysis Theory Found EXAMPLE 3 4 '-Deoxy-9,l l--methylene-4 -oxoerythromycin B-6,9-hemiacetal 4-Deoxy-1 l-methylthiomethyl-4"-oxoerythromycin B (1.0 g., 1.4 mmoles) was dissolved in a solution of 1.0 ml. of water and 30.0 ml. of acetone. When all of the 4 -deoxy-l l-methylthiomethyl-4 -oxoerythro-' mycin B had dissolved, 1.0 g. of mercuric oxide and 1.5 g. of mercuric chloride were added and the resulting mixture was stirred for four hours at room temperature. After stirring, the mixture was filtered through a celite mat and the volume was reduced to ml. The filtrate was added to 50 ml. of water and was extracted with two half volumes of chloroform. The combined chloroform extracts were washed three times with half volumes of water and dried over anhydrous magnesium sulfate. The solvent was removed on the rotary evaporator to give 1.16 gm. of crude product.

Analysis is as follows: Analysis calculated for: C H NO M.W. 727.94; M.P. 98 101C.

Microanalysis Theory EXAMPLE 4 4"-Deoxy-4"-oxoerythromycin B CH3OCH3 4' '-Deoxy-9,l l-O-methylene-4 '-oxoerythromycin B-6,9-hemiacetal (0.98 g., 1.3 mmoles) was dissolved in 50 ml. of methanol. To this solution was added 50 ml. of 0.02N l-lCl (HCl solution was added until pH Z was obtained). After standing at room temperature for one hour, an excess of sodium bicarbonate was added and the solution was extracted three times with chloroform. The combined chloroform extracts were washed with water and dried over sodium sulfate. Solvent was removed to give 0.97 g. of product, which was chromatographed on a silica gel partition column to give 310 mg. (34%) of clean, white crystals (one spot on TLC).

Analysis is as follows:

4"-Deoxy-4"-oxoerythromycin B In this procedure, the 4"-deoxy-4"-oxoerythromycin B compound was prepared directly from the compound of Example 2. Specifically, 4 -deoxy-l lmethylthiomethyl-4"-oxoerythromycin B (1.55 g.) in methanolzwater (17.3, 20 ml.) was treated with a solution of chloramine T (1.25 g.) in methanolzwater 17:3, 4 ml.). The mixture was allowed to stand at room temperature for minutes, then poured into water (150 ml.) and extracted twice with benzene (150 ml. portions). The combined benzene extracts were washed twice with water (150 ml. portions) and extracted twice with 200 ml. portions of 0.1 N hydrochloric acid. The combined acid'extracts were basified with ammonium hydroxide and extracted twice with methylene chloride ml. portions). The combined methylene chloride extracts were concentrated to give, as crude product, a white froth (850 mg.).

A portion of the crude product was purified by preparative layer chromatography on Merck Silica Gel HP 254 plates developed with methanol, benzene, concentrated ammonium hydroxide (33 ml., 67 ml., 3 drops). The major band, as detected by u.v. light, was removed and extracted with cold methanol. The methanol extract was concentrated and the residue was digested in benzene. The benzene solution was filtered and concentrated to give 66 mg. of white froth whose nmr spectrum was identical with that 4"-deoxy-4"-oxoerythromycin B as obtained in Example 4 above.

EXAMPLE 6 2-Acetyl-4"-deoxy-4 '-oxoerythromycin A on ca Erythromyc in A DMSO/Ac L CH3 ocu Erythromycin A (11.4 g.) in dimethyl sulfoxide (120 ml.) was treated with acetic anhydride (40 ml.) and allowed to stand at room temperature for six hours. The mixture was poured into ice cold 5% sodium carbonate solution (l-liter) and extracted twice with chloroform (100 ml. portions). The combined extracts were dried (Na SO filtered and solvent was removed from the filtrate. The white frothy residue was chromatographed over a column of Sephadex LH- in chloroform hexane (1/1, v/v). Initial fractions were combined and recrystallized from methylene chloride/hexane mixtures to give 2'-acety1-4"-deoxy-4"-oxoerythromycin A (3.0 g.) as white crystals, m.p. 117l18C. A max 296 (e, 51

M icroanalysis Theory Found C 60.5 60. 1 H 8.7 8.9 N l .8 1.8

EXAMPLE 7 4"-Deoxy-4"-oxoerythromycin A 2-Acety1-4 deoxy-4"-oxoerythromycin A l (1.213 g.) in methanol ml.) was allowed to stand at room temperature for three days. Solvent was removed and the residue was chromatographed on a column of Sephadex LH-20 in chloroform/hexane (1/1, v/v). The eluates yielded 4"-deoxy-4"-oxoerythromycin A (558 mg.) as a white amorphous solid.

EXAMPLE 8 4' '-Epi-9,1 l-methylenedioxy erythromycin B-6,9-hemiacetal CH3 CH3 CH3 0on Raney Nickell CH CH 4"-Epi-9,1l-methylenedioxy erythromycin 8-69- CH3 hemiacetal (3) (2.0 g.) in pyridine 12 ml.) was treated HQ with acetic anhydride (6 ml.) for 65 hours at room tem- Z perature. The mixture was poured into ice-cold satu- CH rated sodium bicarbonate (250 ml.) and extracted 0 O 0 three times with chloroform (50 ml. portions). The 3 (3) combined chloroform extracts were washed twice in CH 3 O saturated sodium bicarbonate solution (50 ml. por- CZHS 3 tions), then with water (100 ml.). The organic layer CH was dried (Na SO filtered and the filtrate was con- 3 OH centrated to give 2,4' '-diacety1-4 '-epi-9,1 l-

methylenedioxyerythromycin B-6,9-hemiacetal (1.5 g.) as a white amorphous solid.

I, 15 EXAMPLE 1O 9,1l-Methylened1oxy-4 -oxoerythromyc1n B-6,9- H H hemiacetal In (11.6 g.) in ethanol 200 ml.) was 4 y p y y erythromycm CH3 OCH3 heated under reflux with W-2 Raney nickel (-50 g.) B-6,9-hemiacetal for 4 hours. The mixture was cooled, filtered through CH3 CH3 a pad of celite and the celite was washed with ethanol. The combined filtrate and washings were concentrated N to give 5.5 g. of solid. A portion (2 g.) was chromatographed on a column of Sephadex Ll-l-ZO in chloroform/hexane 1/1, v/v). Later fractions yielded 4-epi- 9,1 l-methylenedioxy erythromycin B-6,9-hemiacetal 0 (849 mg.).

Microanalysis Theory Found OCOCHQ (4) C 62.5 62.2 H 9.3 9.2 0 CH OCH N 1.9 1.9

MeOH

EXAMPLE 9 3 3 2'-4"-Diacetyl-4"-epi-9,1 l-methylenedioxy 0 CH erythromycin B-6,9-hemiacetal N CH2 HO CQ; /C1-1 \0 CH3 N O7 0 CH3 "a 0 b 3 cu (3) H 3 wococu O 0 H CH OCH 2'-4"-Diacetyl-4-epi-9,1 l-methylenedioxy erythromycin B-6,9-hemiacetal (4) (1.3 g.) was dissolved in CH3 OCH methanol (100 ml.) and allowed to stand at room temperature for 1 week, then concentrated to give 4"- acetyl-4' -epi-9,1 l-methylenedioxy erythromycin B- 6,9-hemiacetal (1.1 g.) as a white amorphous solid.

ACZO

4-Acetyl-4-epi erythromycin B H CH 4"-Acetyl-4"-epi-9,l l-methylenedioxy erythromycin B-6.9-hemiacetal (1.5 g.) in acetic acid (20 ml.)

was diluted with water ml.) and allowed to stand at 20 room temperature for 3 hours. The mixture was added dropwise to a stirred ice-cold saturated aqueous solution of sodium bicarbonate (l-liter). Ice, ether and solid sodium bicarbonate were added to the bicarbon ate solution during the addition. The mixture was stirred for a further 10 minutes after the addition was complete and was extracted three times with chloroform, (100 ml., 50 ml., 50 ml.). The combined organic extracts were washed twice with water (150 ml. portions) and concentrated. The concentrate was chromatographed on a column of Sephadex LH-20 in chloroform, heptane, ethanol, lO/lO/l (v/v/v). Later eluates were combined to give 4"-acetyl-4"-epierythromycin B (420 mg).

EXAMPLE 12 4-Epi-erythromycin B CH3 CH3 N lfl CH O 3 3) 4"-Epi-9,l l-methylenedioxy erythromycin B-6,9- hemiacetal (3) (5.1 g.) was dissolved in acetic acid ml.) and water 100 ml.) was added. The mixture was allowed to stand at room temperature for 3 /2 hours and then added slowly to K CO g.) in iced water (200 ml.). The mixture was extracted twice with chloroform (100 ml. portions) and the combined extracts were washed with water (200 ml.) and concentrated. The concentrate was passed down a column of Sephadex Ll-l-ZO in chloroform hexane (l/l, v/v). Later eluates were concentrated and recrystallized from chloroform hexane mixtures to give 4"-epi erythromycin B, m.p. l45150C.

CH H0 H0 3i B lfl CH3 3 O H (IV) 0 3 CH3 -o CH OCH Raney Nickel phases were collected after 200 transfers. initial fractions gave 4-epi erythromycin B (356 mg).

The compounds were then tested for their activity against gram-positive and gram-negative bacteria in an agar dilution test. The activity of the compounds is compared with that of both Erythromycin A and Erythromycin B. The results are given in MIC values (minimum inhibitory concentrations) expressed in micrograms/m1.

The results are as follows:

TABLE I MIC (in Meg/ml) Organism Erythromycin A Erythromycin B Ex. 1 Ex. 2

Staphylococcus aureus 9144 0.39 0.39 3.1 3.1 Staphylococcus aureus Smith 0.39 0.39 3.1 3.1 Staphylococcus aureus Smith ER 100 100 100 100 Staphylococcus aureus Quinones 100 100 100 100 Staphylococcus aureus Wise 155 100 100 100 100 Streptococcus faecalis 10541 0.1 0.1 0.39 0.78 Escherichia coli Juhl 50 100 1000 1000 Klebst'ella pneumoniae 10031 6.2 6.2 25 50 Proteus vulgaris Abbott .1] 100 100 1000 lOO Proteus ntt'rabt'lis Finland No. 9 100 100 1000 l000 Salmonella typht'muriunt Ed No. 9 50 100 1000 1000 Sltt'gella sonnet 9290 25 25 100 100 Pseudomonas aeruginosa BMH No. 10 100 100 1000 1000 Streptococcus pyogenes Roper 100 100 100 100 Streptococcus pyogenes Scott 100 100 100 100 Haemop/tilus influenzae 9334 6.2 6.2 100 100 Haemophilus influenzae Brimm 3.1 3.1 50 O Haemophilus influenzae Illinois 1.56 3.1 25 25 Haemophilus influenzae Patterson 3.1 3.1 50 100 Haemop/zilus influenzae Shemwell 3.1 3.1 50 100 Haemophilus influenzae Terry 3.1 3.1 50 100 Ex. 3 Ex. 4 Ex. 6 Ex. 7 Ex. 8

Staphylococcus auretts 9144 0.78 3.1 0.78 1.6 0.78 Staphylococcus aureus Smith 0.78 3.1 1.6 1.6 0.78 Staphylococcus aureus Smith ER 100 100 100 100 100 Staphylococcus aureus Quinones 100 100 100 100 Staphylococcus aureus Wise 155 25 100 100 100 Streptococcus faecalt's 10541 0.39 0.78 0.39 0,39 0.39 Escherichia coli Juhl 1000 1000 100 100 100 Klebsiella pneumoniae 10031 25 25 l2 12 25 Proteus vulgaris Abbott .Ll 1000 l000 100 100 100 Proteus miraln'lts- Finland No. 9 l000 1000 100 100 100 Salmonella typht'murt'um Ed No. 9 l000 1000 100 100 100 Sht'gella sonnet 9290 100 100 100 50 100 Pseudomonas aerugt'nosa BMH No. 10 1000 1000 100 100 100 Strepttu'occus pyogcnes Roper 100 100 100 100 100 Streptococcus psogenes Scott 100 100 100 100 100 Haentophilus influenzac 9334 100 5O 25 Hacntophilus influenzac Brimm 100 25 12 12 HlIclIlOII/tl/HS influenzae Illinois 25 l2 l2 Hacmophilus t'nfluenzae Patterson 50 12 12 Haemophiltts in flucnzac Shemwell 100 50 12 12 Huemophtlus influenzae Terry 100 25 12 12 Ex. 9 Ex. 10 Ex. 11 Ex. 12

Staphylococcus aurcus 9144 1.56 1.56 0.39 0.39 Staphylococcus aurcus Smith 1.56 1.56 0.39 0.39 Staphylococcus attretts Smith ER 100 100 100 6.2 Staphylococcus aureus Quinones 6.2 6.2 25 50 Staphylococcus attreus Wise 6.2 6.2 100 25 Streptococcus faecalis 10541 0.78 0.78 0.1 0.2 Escherichia (U/l Juhl 100 100 100 100 Klebsiella pnettntont'ae 10031 100 100 50 6.2 Proteus vulgaris Abbott .1] 100 100 100 100 Proteus mirabilis Finland No. 9 100 100 100 100 Salmonella typhimttrt'um Ed N0. 9 100 100 100 100 S/tt'gella sonnei 9290 100 100 100 25 Psemt'omonas aeruginosa BMH No. 10 100 100 100 100 Streptococcus p \ogencs Roper 50 50 100 12.5 Streptococcus pyogencs Scott 100 100 100 3. l

Haemopht'lus influenzae 9334 Haemophilus influenzae Brimm Haentoplu'lus influenzae Illinois Haemoplzilus influenzac Patterson Huenzoplu'lus influenzae Shemwell Haemopht'lus influcnzae Terry where R is hydrogen or RCO where R is as before defined, R is hydrogen, CH CO or RC; and

We claim: 1. A 4"-deoxy-4"-oxoerythromycin derivative having a formula selected from the group consisting of:

Formula III 5 Formula V CH cr1 33 3 CH CH N 0 no R0 CH 3 CH H0 CH3 HO 0 CH HO O 0 CH3 HO CH CH5 0 H CH3 CH 0 H3 C l-l O o 2 5 l 3 0 r.' CH3 o 0 cu 0on CH OCl-l 3 where R is hydrogen or CH CO;

where R is H or RCO where R is as before defined. Formula IV 2. The compound of claim 1 wherein R is CH CO in Formula III. 3 3. The compound of claim 1 wherein R is H in Formula III.

4. The compound of claim 1 wherein R and R are H in Formula IV. 5. The compound of claim 1 wherein R and R are 3 Cl-l CO in Formula IV.

6. The compound of claim 1 wherein R is hydrogen and R is CH CO in Formula IV.

7. The compound of claim 1 wherein R is CH CO in Formula V.

8. The compound of claim 1 wherein R is hydrogen. 

1. A 4"-DEOXY-4"-OXOERYTHROMYCIN DERIVATIVE HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF:
 2. The compound of claim 1 wherein R is CH3CO in Formula III.
 3. The compound of claim 1 wherein R is H in Formula III.
 4. The compound of claim 1 wherein R1 and R2 are H in Formula IV.
 5. The compound of claim 1 wherein R1 and R2 are CH3CO in Formula IV.
 6. The compound of claim 1 wherein R1 is hydrogen and R2 is CH3CO in Formula IV.
 7. The compound of claim 1 wherein R3 is CH3CO in Formula V.
 8. The compound of claim 1 wherein R3 is hydrogen. 